Apparatus for compensating spindle of machine tool, and method for compensating same

Abstract

The present invention relates to an apparatus for compensating a spindle of a machine tool and a method for compensating same, which allow a control unit, during workpiece processing, to compensate in real time for dimensional deviations of a spindle according to turning-center-type processing not requiring tool rotation and machining-center-type processing requiring tool rotation, thereby enabling machining precision of a machine tool to be improved.

Description

Spindle compensation device of a compound processing machine and compensation method thereof

[0001] The present invention relates to a spindle compensation device of a compound processing machine and a compensation method thereof, and more particularly, to a spindle compensation device of a compound processing machine and a compensation method thereof, which can improve the processing precision of the compound processing machine by automatically compensating in real time the dimensional deviation of the spindle according to a turning center type processing method that does not require tool rotation during processing of a workpiece and a machining center type processing method that requires tool rotation.

[0002] In general, a machine tool refers to a machine used for the purpose of processing a metal / non-metal workpiece into a desired shape and size using an appropriate tool using various cutting or non-cutting processing methods.

[0003] Various types of machine tools, including turning centers, vertical / horizontal machining centers, gate-type machining centers, Swiss turns, electrical discharge machines, horizontal NC boring machines, and CNC lathes, are widely used in various industrial fields for their respective tasks.

[0004] Many types of machine tools in use today typically feature control panels utilizing numerical control (NC) or computerized numerical control (CNC) technology. These panels feature various function switches or buttons and a monitor.

[0005] In addition, the machine tool is equipped with a table on which the workpiece material is placed and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle on which a tool or workpiece is combined and rotates, a tailstock for supporting the workpiece during processing, a vibration damper, etc.

[0006] Typically, in machine tools, the table, tool rest, spindle, tailstock, and oscillation unit are equipped with a transfer unit that moves along the transfer axis to perform various processing operations.

[0007] Additionally, machine tools generally use multiple tools for various processing operations, and tool magazines or turrets are used as tool storage spaces for storing multiple tools.

[0008] These machine tools use multiple tools for various processing tasks, and a tool magazine is used as a tool storage space to store multiple tools.

[0009] Additionally, machine tools are generally equipped with an automatic tool changer (ATC) to retrieve or retract a specific tool from the tool magazine under the command of the numerical control unit in order to improve the productivity of the machine tool.

[0010] Additionally, machine tools are typically equipped with an automatic pallet changer (APC) to minimize downtime. The APC automatically exchanges pallets between the workpiece processing area and the workpiece installation area. Pallets can be loaded with workpieces.

[0011] Additionally, machine tools are generally classified into turning centers and machining centers depending on the processing method.

[0012] In general, a machine tool that can perform various machining processes such as turning, milling, drilling, tapping, and boring in one workpiece step is called a multi-task center or integrated mill turn center.

[0013] These complex machining machines can reduce lead times, number of parts, workload, and workspace, while also improving productivity and precision.

[0014] As illustrated in Fig. 1, a conventional compound processing machine (2) processes a workpiece placed on a table while a tool (4) is clamped to a spindle (3). That is, the spindle processes the workpiece while moving in the horizontal direction (X-axis), vertical direction (Y-axis), and height direction (Z-axis).

[0015] In particular, the tool mounted on the main shaft of such a complex processing machine must rotate when operating as a machining center, and when operating as a turning center, the tool must be fixed firmly without rotating and must function like a turret.

[0016] In this way, a complex machining center performs the conflicting functions of a machining center where the tool must rotate and a turning center where the tool does not rotate. In order to do this, additional mechanical parts such as a pneumatic cylinder and springs are additionally installed inside the main shaft, and dimensional deviations inevitably occur due to complex physical characteristics such as stress, elastic limit, and tolerance.

[0017] Specifically, the dimensional deviation of the main spindle of a compound processing machine is caused by changes in the hydraulic and pneumatic supply pressure of the cylinders for tool clamping and unclamping of the spindle and the curvic coupling mounted inside the main spindle, elastic deformation of the material, wear of the tool taper surface, and fine foreign matter.

[0018] In this way, if the main axis of the complex machining machine is not subject to error compensation, there is a problem in that the machining precision is reduced, thereby reducing the safety and reliability of the machine tool.

[0019] In addition, if the main shaft of the complex machining machine is not corrected for errors, there is a problem of wasting resources due to an increase in the occurrence rate of defective products, and damage or breakage of equipment or tools increases due to unstable conditions of tools, etc., which increases maintenance costs and time, and productivity decreases due to an increase in non-processing time.

[0020] Moreover, the spindle compensation device and compensation method of conventional general machine tools, unlike complex machining machines, only perform one function, so there was a problem that the error occurrence was different, and the accuracy and reliability of error compensation were reduced.

[0021] The present invention is to solve the above problems, and the purpose of the present invention is to provide a spindle compensation device of a compound processing machine and a compensation method thereof, which can improve the processing precision of a machine tool, maximize reliability and stability, and increase productivity and quality, thereby increasing consumer satisfaction by automatically compensating the dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during processing of a workpiece and a machining center type processing method that requires tool rotation.

[0022] In order to achieve the object of the present invention, a spindle compensation device of a compound processing machine according to the present invention includes: a tool for processing a workpiece; a spindle having a fixed portion and a rotary portion, and on which the tool is detachably mounted on the rotary portion; a tool clamping portion disposed inside the spindle for clamping or unclamping the tool to the spindle; a coupling portion disposed inside the spindle for clamping or unclamping the rotary portion and the fixed portion; and a control unit for correcting the position of the spindle; wherein the control unit can automatically correct a dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during processing of a workpiece and a machining center type processing method that requires tool rotation.

[0023] In addition, in another preferred embodiment of the main shaft compensation device of the compound processing machine according to the present invention, the main shaft compensation device of the compound processing machine may further include a displacement detection unit that detects displacement of a tool diameter mounted on the rotating unit; and a pressure detection unit that detects pressure supplied to the tool clamping unit and the coupling unit.

[0024] In addition, in another preferred embodiment of the spindle compensation device of the compound processing machine according to the present invention, the control unit of the spindle compensation device of the compound processing machine may include: a database unit that stores data for compensating for dimensional deviation of the spindle according to a turning center type machining method that does not require tool rotation during workpiece processing and a machining center type machining method that requires tool rotation; an analysis unit that compares the data stored in the database unit with the data detected by the displacement detection unit and the pressure detection unit to analyze whether dimensional deviation of the spindle occurs; and a correction unit that calculates a correction amount and performs correction when dimensional deviation of the spindle occurs according to the data stored in the database unit and the analysis result of the analysis unit.

[0025] In addition, in another preferred embodiment of the spindle compensation device of the compound processing machine according to the present invention, the database section of the spindle compensation device of the compound processing machine may include a basic data storage section that stores data on workpiece information, tool information, spindle information, and a machining program; a reference data storage section that stores data on a tool diameter displacement reference value, a standard tool diameter displacement value, a reference runout value, a standard runout table, a pressure reference value, and a standard pressure value table for each tool; and a detection data storage section that stores data detected by the displacement detection section and the pressure detection section.

[0026] In addition, in another preferred embodiment of the spindle compensation device of the compound processing machine according to the present invention, the analysis unit of the spindle compensation device of the compound processing machine may include a confirmation unit that confirms whether a tool is currently mounted on the spindle and the type of tool through the data stored in the basic data storage unit; a judgment unit that determines a machining method when machining a workpiece with a tool currently mounted on the spindle through the confirmation result of the confirmation unit and the data stored in the basic data storage unit; and a Z-axis position comparison unit that compares whether a detection pressure value exceeds a pressure reference value based on data stored in the reference data storage unit and the detection data storage unit when the judgment result of the judgment unit corresponds to one of a turning center type machining method that does not require tool rotation when machining a workpiece and a machining center type machining method that requires tool rotation.

[0027] In addition, in another preferred embodiment of the main shaft compensation device of the compound processing machine according to the present invention, the analysis unit of the main shaft compensation device of the compound processing machine may further include a tool diameter comparison unit that compares whether the detected tool diameter displacement value exceeds the tool diameter displacement reference value according to data stored in the reference data storage unit and the detection data storage unit when the determination result of the determination unit is that the machining center type processing method requires rotation of the tool.

[0028] In addition, in another preferred embodiment of the main shaft compensation device of the compound processing machine according to the present invention, the compensation unit of the main shaft compensation device of the compound processing machine may include a Z-axis position compensation amount calculation unit that calculates a Z-axis position compensation amount through data stored in the basic data storage unit and the reference data storage unit when the pressure value detected as a result of comparison by the Z-axis position comparison unit exceeds a pressure reference value; a tool diameter compensation amount calculation unit that calculates a tool diameter compensation amount through data stored in the basic data storage unit and the reference data storage unit when the tool diameter displacement value detected as a result of comparison by the tool diameter comparison unit exceeds a tool diameter displacement reference value; and a processing unit that performs Z-axis position compensation with the calculated Z-axis position compensation amount in the case of a turning center-type machining method that does not require tool rotation during workpiece machining, and simultaneously performs Z-axis position compensation with the calculated Z-axis position compensation amount in the case of a machining center-type machining method that requires tool rotation, and performs tool diameter compensation with the calculated tool diameter compensation amount.

[0029] In addition, in another preferred embodiment of the main shaft compensation device of the compound processing machine according to the present invention, the Z-axis position compensation amount calculation unit of the main shaft compensation device of the compound processing machine can calculate the Z-axis position compensation amount through linear interpolation using the detected pressure value detected through the pressure sensing unit and the standard pressure value table stored in the reference data storage unit.

[0030] In addition, in another preferred embodiment of the main shaft compensation device of the compound processing machine according to the present invention, the tool diameter compensation amount calculation unit of the main shaft compensation device of the compound processing machine can calculate the tool diameter compensation amount by the X-axis position compensation amount and the Y-axis position compensation amount through linear interpolation by the tool diameter displacement value detected by the displacement detection unit, the standard tool diameter displacement value stored in the reference data storage unit, and the standard runout table.

[0031] In order to achieve another object of the present invention, a method for compensating a spindle of a compound processing machine according to the present invention comprises the steps of: storing data for compensating a dimensional deviation of a spindle according to a turning center type processing method that does not require tool rotation during processing of a workpiece and a machining center type processing method that requires tool rotation; confirming whether a tool is currently mounted on the spindle and the type of tool through the pre-stored data; detecting pressure supplied to a tool clamping unit and a coupling unit and / or displacement of a tool diameter mounted on the spindle; determining a processing method when processing a workpiece with a tool currently mounted on the spindle through the confirmation result and the pre-stored data; comparing a Z-axis position according to the pre-stored data to determine whether a detected pressure value exceeds a pressure reference value when the judgment result corresponds to either a turning center type processing method that does not require tool rotation during processing of a workpiece or a machining center type processing method that requires tool rotation; calculating a Z-axis position compensation amount through the pre-stored data when the detected pressure value exceeds the pressure reference value as a result of the Z-axis position comparison; And, in the case of a turning center type machining method that does not require tool rotation when machining a workpiece as a result of the judgment, a step of performing Z-axis position compensation using the calculated Z-axis position compensation amount may be included.

[0032] In addition, in another preferred embodiment of the spindle compensation method of the compound processing machine according to the present invention, the spindle compensation method of the compound processing machine may further include, after the step of calculating the Z-axis position compensation amount, if it is determined that the method is a machining center-type machining method that requires rotation of the tool, a step of comparing the tool diameter displacement according to pre-stored data to determine whether the detected tool diameter displacement value exceeds a tool diameter displacement reference value; a step of calculating the tool diameter compensation amount through the pre-stored data if the detected tool diameter displacement value exceeds the tool diameter displacement reference value as a result of the tool diameter displacement comparison; and a step of performing compensation for the dimensional deviation of the spindle using the calculated Z-axis position compensation amount and the calculated tool diameter displacement compensation amount if it is determined that the method is a machining center-type machining method that requires rotation of the tool when machining the workpiece.

[0033] The spindle compensation device of a compound processing machine and the compensation method thereof according to the present invention automatically compensate for the dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during workpiece processing and a machining center type processing method that requires tool rotation, thereby compensating the spindle of the compound processing machine and improving the processing precision of the compound processing machine.

[0034] In addition, the main shaft compensation device of the composite processing machine according to the present invention and the compensation method thereof have the effect of maximizing the reliability and stability of the machine tool by improving processing precision.

[0035] Furthermore, the main shaft compensation device of the composite processing machine according to the present invention and the compensation method thereof have the effect of improving processing quality by improving processing precision, thereby improving consumer satisfaction, and reducing processing costs by minimizing waste of workpieces.

[0036] In addition, the main shaft compensation device of the compound processing machine and the compensation method thereof according to the present invention have the effect of saving resources by preventing waste of workpieces and increasing productivity by reducing the non-processing time of the machine tool through improving processing precision.

[0037] Figure 1 shows a conceptual diagram of a conventional composite processing machine.

[0038] Figure 2 shows a conceptual diagram of a main shaft compensation device of a composite processing machine according to the present invention.

[0039] Figure 3 shows a conceptual diagram of a turning center type machining method in a main shaft compensation device of a compound processing machine according to one embodiment of the present invention.

[0040] Figure 4 shows a conceptual diagram of a main shaft compensation device of a compound processing machine according to one embodiment of the present invention in a machining center type processing method.

[0041] Figure 5 shows a configuration diagram of a control unit of a main shaft compensation device of a composite processing machine according to one embodiment of the present invention.

[0042] Figure 6 shows a graph of the displacement change amount detected by the displacement detection unit of a composite processing machine according to one embodiment of the present invention.

[0043] Figure 7 shows a procedure diagram of a main axis compensation method of a composite processing machine according to the present invention.

[0044] Hereinafter, a spindle compensation device and a compensation method thereof for a compound processing machine according to an embodiment of the present invention will be described in detail with reference to drawings. The embodiments introduced below are provided as examples to ensure that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Therefore, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers represent like elements throughout the specification.

[0045] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

[0046] The terminology used herein is for the purpose of describing embodiments and is therefore not intended to be limiting of the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprise" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements mentioned.

[0047] Fig. 2 is a conceptual diagram of a spindle compensation device of a compound processing machine according to the present invention. Fig. 3 is a conceptual diagram of a spindle compensation device of a compound processing machine according to an embodiment of the present invention in a turning center type machining method. Fig. 4 is a conceptual diagram of a spindle compensation device of a compound processing machine according to an embodiment of the present invention in a machining center type machining method. Fig. 5 is a configuration diagram of a control unit of a spindle compensation device of a compound processing machine according to an embodiment of the present invention. Fig. 6 is a graph of a displacement change amount detected by a displacement detection unit of a compound processing machine according to an embodiment of the present invention. Fig. 7 is a procedure diagram of a spindle compensation method of a compound processing machine according to the present invention.

[0048] Referring to FIGS. 2 to 6, a spindle compensation device (1) of a compound processing machine according to the present invention will be described. As illustrated in FIGS. 2 to 6, the spindle compensation device (1) of a compound processing machine according to the present invention includes a tool (100), a spindle (200), a tool clamping unit (300), a coupling unit (400), a displacement detection unit (500), a pressure detection unit (600), and a control unit (700).

[0049] A tool (100) is mounted on a spindle and processes a workpiece. The tool mounted on the spindle of this complex processing machine must rotate when operating as a machining center, and when operating as a turning center, the tool does not rotate but is rigidly fixed, performing a function similar to a turret.

[0050] The main shaft (200) has a fixed part (210) and a rotating part (220), and the tool is detachably mounted on the rotating part.

[0051] The tool clamping unit (300) is arranged inside the spindle to clamp or unclamp the tool to the spindle.

[0052] A coupling part (400) is positioned within the main shaft to clamp or unclamp the rotating part and the fixed part. Although not necessarily limited thereto, the coupling part may be formed in the form of a curvic coupling and installed as a pair at the upper and lower portions of the main shaft.

[0053] The displacement detection unit (500) detects the displacement of the tool diameter mounted on the rotating unit.

[0054] As illustrated in Fig. 6, the displacement detection unit can detect displacement through the phase difference of a square wave or a voltage change in a magnetic field. In addition, the displacement detection unit is preferably formed as an LVDT sensor to detect the displacement of a tool diameter mounted on a rotating part and transmit it to a control unit.

[0055] The pressure sensing unit (600) senses the pressure supplied to the tool clamping unit and the coupling unit. Preferably, the pressure sensing unit is formed as a pressure sensor to measure the pneumatic or hydraulic pressure supplied to the tool clamping unit and the coupling unit and transmit the same to the control unit.

[0056] The control unit (700) corrects the position of the main shaft.

[0057] These control units include NC (numerical control) or CNC (computerized numerical control) and have various numerical control programs built in.

[0058] In addition, although not shown in the drawing, according to a preferred embodiment of the present invention, the numerical control unit includes a main operation unit, and the main operation unit includes a screen display program and a data input program according to screen display selection, and performs a function of displaying a software switch on a display screen according to an output of the screen display program, and recognizing the on / off of the software switch to issue an input / output command for machine operation.

[0059] Additionally, but not necessarily limited to this, the main control unit is installed on the housing, case, or one side of the machine tool and is equipped with various function switches or buttons and a monitor capable of displaying various information.

[0060] Specifically, the control unit automatically corrects the dimensional deviation of the main shaft in real time according to the turning center type machining method that does not require tool rotation during workpiece processing and the machining center type machining method that requires tool rotation.

[0061] The spindle compensation device of a compound processing machine according to the present invention automatically compensates for the dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during workpiece processing and a machining center type processing method that requires tool rotation, thereby compensating the spindle of the compound processing machine and improving the processing precision of the compound processing machine.

[0062] As illustrated in FIGS. 2 to 5, the control unit (700) of the main shaft compensation device of the composite processing machine according to the present invention includes a database unit (710), an analysis unit (720), and a compensation unit (730).

[0063] The database section (710) stores data for correcting the dimensional deviation of the main shaft according to a turning center type machining method that does not require tool rotation when machining a workpiece and a machining center type machining method that requires tool rotation.

[0064] This database unit may be a variety of storage devices such as ROM, RAM, EPROM, flash drive, hard drive, etc., and may also be a web storage that performs the storage function of the storage unit (410) on the Internet.

[0065] The analysis unit (720) compares the data stored in the database unit with the data detected by the displacement detection unit and the pressure detection unit to analyze whether a dimensional deviation of the main shaft occurs.

[0066] The correction unit (730) calculates the correction amount and performs correction when a dimensional deviation of the main axis occurs based on the data stored in the database unit and the analysis results of the analysis unit.

[0067] Although not shown in the drawing, the control unit may include a display unit, and the display unit may display the results of the database unit, analysis unit, and correction unit in real time to improve user convenience.

[0068] The display unit may include at least one of a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display, a 3D display, and an e-ink display.

[0069] In addition, the display unit includes a screen display program and a data input program according to screen display selection, and performs the function of displaying a software switch on the display screen according to the output of the screen display program and recognizing the on / off status of the software switch to issue an input / output command for machine operation.

[0070] Additionally, although not necessarily limited thereto, the display unit may be installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

[0071] As illustrated in FIG. 5, the database section (710) of the control unit (700) of the main shaft compensation device of the composite processing machine according to the present invention includes a basic data storage section (711), a reference data storage section (712), and a detection data storage section (713).

[0072] The basic data storage unit (711) stores data on workpiece information, tool information, spindle information, and machining programs.

[0073] The reference data storage unit (712) stores data for each tool regarding the tool diameter displacement reference value, standard tool diameter displacement value, reference runout value, standard runout table, pressure reference value, and standard pressure value table.

[0074] The detection data storage unit (713) stores data detected by the displacement detection unit and the pressure detection unit.

[0075] As illustrated in FIG. 5, the analysis unit (720) of the control unit (700) of the main shaft compensation device of the composite processing machine according to the present invention includes a confirmation unit (721), a judgment unit (722), a Z-axis position comparison unit (723), and a tool diameter comparison unit (724).

[0076] The verification unit (721) checks whether a tool is currently mounted on the spindle and the type of tool through the data stored in the basic data storage unit.

[0077] The judgment unit (722) determines the processing method when processing a workpiece using the tool currently mounted on the main shaft through the verification result of the verification unit and the data stored in the basic data storage unit.

[0078] The Z-axis position comparison unit (723) compares whether the detection pressure value exceeds the pressure reference value based on the data stored in the reference data storage unit and the detection data storage unit when the judgment result of the judgment unit determines that the workpiece is machined in either a turning center-type machining method that does not require tool rotation or a machining center-type machining method that requires tool rotation. In other words, it compares whether there is an abnormality in the height direction based on the main axis.

[0079] If the judgment result of the judgment unit indicates that the machining center type machining method requires rotation of the tool, the tool diameter comparison unit (724) additionally compares whether the detected tool diameter displacement value exceeds the tool diameter displacement reference value based on the data stored in the reference data storage unit and the detection data storage unit.

[0080] As illustrated in FIG. 5, the correction unit (730) of the control unit (700) of the main shaft correction device of the composite processing machine according to the present invention includes a Z-axis position correction amount calculation unit (731), a tool diameter correction amount calculation unit (732), and a processing unit (733).

[0081] The Z-axis position correction amount calculation unit (731) calculates the Z-axis position correction amount through data stored in the basic data storage unit and the reference data storage unit when the pressure value detected as a result of comparison by the Z-axis position comparison unit exceeds the pressure reference value.

[0082] The Z-axis position correction amount calculation unit calculates the Z-axis position correction amount through linear interpolation using the pressure value detected by the pressure detection unit and the standard pressure value table stored in the reference data storage unit.

[0083] The tool diameter compensation amount calculation unit (732) calculates the tool diameter compensation amount through data stored in the basic data storage unit and the reference data storage unit when the tool diameter displacement value detected as a result of comparison by the tool diameter comparison unit exceeds the tool diameter displacement reference value.

[0084] The tool diameter compensation amount calculation unit calculates the tool diameter compensation amount by the X-axis position compensation amount and the Y-axis position compensation amount through linear interpolation using the tool diameter displacement value detected by the displacement detection unit, the standard tool diameter displacement value stored in the reference data storage unit, and the standard runout table.

[0085] Accordingly, even if data is not stored in the storage unit, the corresponding value can be calculated through linear interpolation, enabling quick and accurate correction in all sections, thereby improving safety and reliability and reducing equipment manufacturing costs.

[0086] In the case of a turning center type machining method that does not require tool rotation during workpiece machining, the processing unit (733) performs Z-axis position compensation using the calculated Z-axis position compensation amount, and in the case of a machining center type machining method that requires tool rotation, the processing unit performs Z-axis position compensation using the calculated Z-axis position compensation amount and simultaneously performs tool diameter compensation using the calculated tool diameter compensation amount.

[0087] Referring to Fig. 7, a spindle compensation method of a compound processing machine according to the present invention will be described. As illustrated in Fig. 7, the spindle compensation method of a compound processing machine according to the present invention includes a data storage step (S1), a confirmation step (S2), a detection step (S3), a judgment step (S4), a Z-axis position comparison step (S5), and a Z-axis position compensation amount calculation step (S6). If it is determined that tool rotation is not necessary, only the Z-axis position is compensated and machining is performed.

[0088] The overall operating principle, control method, and equipment configuration of the main shaft compensation method of the composite processing machine according to the present invention are the same as those of the main shaft compensation device of the composite processing machine according to the present invention described above. The following description focuses on the differences.

[0089] However, if the judgment result of the judgment step requires tool rotation, compensation according to the tool diameter error must be performed, and thus a tool diameter comparison step (S8), a tool diameter compensation amount calculation step (S9), and a Z-axis position and / or tool diameter displacement compensation step (S10) are further included.

[0090] Data for compensating for spindle dimensional deviation is stored according to the turning center type machining method that does not require tool rotation during workpiece processing and the machining center type machining method that requires tool rotation.

[0091] After the data storage step (S1), the presence or absence of a tool on the main axis and the type of tool are checked through the previously stored data.

[0092] After the verification step (S2), the pressure supplied to the tool clamping unit and coupling unit and / or the displacement of the tool diameter mounted on the spindle are detected.

[0093] After the detection step (S3), the processing method for processing the workpiece using the tool currently mounted on the spindle is determined based on the verification result and the previously stored data.

[0094] After the judgment step (S4), if the judgment result is that the workpiece is machined in either a turning center-type machining method that does not require tool rotation or a machining center-type machining method that requires tool rotation, the Z-axis position is compared to see if the detected pressure value exceeds the pressure reference value according to the stored data.

[0095] After the Z-axis position comparison step (S5), if the pressure value detected as a result of the Z-axis position comparison exceeds the pressure reference value, the Z-axis position correction amount is calculated using the stored data.

[0096] After the Z-axis position compensation amount calculation step (S6), if it is determined that the turning center type machining method does not require tool rotation when machining the workpiece, Z-axis position compensation is performed using the calculated Z-axis position compensation amount.

[0097] After the step of calculating the Z-axis position compensation amount, if it is determined that the machining center type machining method requires rotation of the tool, the tool diameter displacement is compared to see if the detected tool diameter displacement value exceeds the tool diameter displacement reference value according to additionally stored data.

[0098] After the tool diameter comparison step (S8), if the tool diameter displacement value detected as a result of the tool diameter displacement comparison exceeds the tool diameter displacement reference value, the tool diameter compensation amount is calculated using the pre-stored data.

[0099] After the tool diameter compensation amount calculation step (S9), if it is determined that the machining center type machining method requires tool rotation when machining the workpiece, compensation for the dimensional deviation of the main axis is performed using the calculated Z-axis position compensation amount and the calculated tool diameter displacement compensation amount.

[0100] The compensation principle of the main shaft compensation device of the composite processing machine according to the present invention and the compensation method thereof are explained with reference to FIGS. 2 to 6.

[0101] Basic data is stored in the basic data storage unit and the reference data storage unit. Afterwards, when machining a workpiece, the turning center type machining method that does not require tool rotation and the machining center type machining method that requires tool rotation are determined, and the displacement detection unit checks for abnormalities in the X and Y axes according to the tool diameter displacement, and the pressure detection unit checks for abnormalities in the Z axis and compares them.

[0102] If an abnormality occurs in the comparison result, the Z-axis position compensation amount calculation unit and the tool diameter compensation amount calculation unit calculate and compensate for the spindle error according to the processing method.

[0103] Therefore, the spindle compensation device of a compound processing machine and the compensation method thereof according to the present invention automatically compensate for the dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during workpiece processing and a machining center type processing method that requires tool rotation, thereby compensating the spindle of the compound processing machine to improve the processing precision of the compound processing machine, maximize the reliability and stability of the machine tool, improve the processing quality to enhance consumer satisfaction, minimize waste of workpieces to reduce processing costs, save resources by preventing waste of workpieces, and increase productivity by reducing the non-processing time of the machine tool through improved processing precision.

[0104] Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims below. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

[0105] <Explanation of symbols>

[0106] 1: Spindle compensation device

[0107] 100: Tools

[0108] 200: Main axis

[0109] 300: Tool clamping part

[0110] 400: Coupling part

[0111] 500: Displacement detection unit

[0112] 600: Pressure sensor

[0113] 700: Control unit

Claims

1. A tool for processing a workpiece; A main shaft having a fixed part and a rotating part, and on which the tool is detachably mounted on the rotating part; A tool clamping unit arranged inside the spindle to clamp or unclamp the tool to the spindle; A coupling part arranged inside the main shaft to clamp or unclamp the rotating part and the fixed part; and A control unit for correcting the position of the main axis; The above control unit is a spindle compensation device of a compound processing machine characterized in that it automatically compensates for the dimensional deviation of the spindle in real time according to a turning center type processing method that does not require tool rotation during workpiece processing and a machining center type processing method that requires tool rotation.

2. In paragraph 1, A displacement detection unit that detects the displacement of the tool diameter mounted on the above rotating unit; and A spindle compensation device for a compound processing machine, characterized in that it further includes a pressure sensing unit that senses the pressure supplied to the tool clamping unit and the coupling unit.

3. In paragraph 2, The above control unit, A database section storing data for correcting the dimensional deviation of the main shaft according to a turning center type machining method that does not require tool rotation during workpiece processing and a machining center type machining method that requires tool rotation; An analysis unit that compares the data stored in the database unit with the data detected by the displacement detection unit and the pressure detection unit and analyzes whether a dimensional deviation of the main shaft occurs; and A spindle compensation device for a composite processing machine, characterized by including a compensation unit that calculates a compensation amount and performs compensation when a dimensional deviation of the spindle occurs based on data stored in the database unit and an analysis result of the analysis unit.

4. In paragraph 3, The above database section, A basic data storage unit that stores data on workpiece information, tool information, spindle information, and machining programs; A reference data storage unit that stores data for each tool for a reference tool diameter displacement value, a standard tool diameter displacement value, a reference runout value, a standard runout table, a pressure reference value, and a standard pressure value table; and A main shaft compensation device for a composite processing machine, characterized by including a detection data storage unit that stores data detected by the displacement detection unit and the pressure detection unit.

5. In paragraph 4, The above analysis unit, A confirmation unit that checks whether a tool is currently mounted on the main shaft and the type of tool through data stored in the basic data storage unit; A judgment unit that judges the processing method when processing a workpiece using the tool currently mounted on the main shaft based on the verification result of the above verification unit and the data stored in the basic data storage unit; and A main shaft compensation device for a composite processing machine, characterized in that it includes a Z-axis position comparison unit that compares whether the detection pressure value exceeds the pressure reference value according to the data stored in the reference data storage unit and the detection data storage unit when the judgment result of the judgment unit corresponds to either a turning center type processing method that does not require tool rotation during workpiece processing or a machining center type processing method that requires tool rotation.

6. In paragraph 5, The above analysis unit, A main shaft compensation device for a compound processing machine, characterized in that, if the result of the judgment of the above judgment unit is a machining center type processing method requiring tool rotation, the main shaft compensation device further includes a tool diameter comparison unit that compares whether the detection tool diameter displacement value exceeds the tool diameter displacement reference value according to the data stored in the reference data storage unit and the detection data storage unit.

7. In paragraph 6, The above correction part, A Z-axis position correction amount calculation unit that calculates a Z-axis position correction amount through data stored in the basic data storage unit and the reference data storage unit when the pressure value detected as a result of comparison of the Z-axis position comparison unit exceeds the pressure reference value; A tool diameter compensation amount calculation unit that calculates a tool diameter compensation amount through data stored in the basic data storage unit and the reference data storage unit when the tool diameter displacement value detected as a result of comparison by the tool diameter comparison unit exceeds the tool diameter displacement reference value; and A main shaft compensation device for a compound processing machine, characterized in that it includes a processing unit that performs Z-axis position compensation with a calculated Z-axis position compensation amount in the case of a turning center-type machining method that does not require tool rotation during workpiece processing, and simultaneously performs Z-axis position compensation with the calculated Z-axis position compensation amount and tool diameter compensation with the calculated tool diameter compensation amount in the case of a machining center-type machining method that requires tool rotation.

8. In paragraph 7, A main shaft compensation device for a compound processing machine, characterized in that the Z-axis position compensation amount calculation unit calculates the Z-axis position compensation amount through linear interpolation using the pressure value detected by the pressure sensing unit and the standard pressure value table stored in the reference data storage unit.

9. In paragraph 7, A main shaft compensation device for a compound processing machine, characterized in that the tool diameter compensation amount calculation unit calculates the tool diameter compensation amount by the X-axis position compensation amount and the Y-axis position compensation amount through linear interpolation using the tool diameter displacement value detected by the displacement detection unit, the standard tool diameter displacement value stored in the reference data storage unit, and the standard runout table.

10. A step of storing data for compensating for the dimensional deviation of the main shaft according to a turning center type machining method that does not require tool rotation when machining a workpiece and a machining center type machining method that requires tool rotation; A step of checking whether a tool is currently mounted on the spindle and the type of tool through pre-saved data; A step of detecting the pressure supplied to the tool clamping unit and coupling unit and / or the displacement of the tool diameter mounted on the main shaft; A step of determining a processing method when processing a workpiece using a tool currently mounted on the spindle based on the verification result and previously stored data; A step of comparing the Z-axis position to see if the detected pressure value exceeds the pressure reference value according to the stored data in case the judgment result corresponds to either a turning center type machining method that does not require tool rotation during workpiece machining or a machining center type machining method that requires tool rotation; A step of calculating a Z-axis position correction amount through pre-stored data when the detected pressure value as a result of comparing the Z-axis position exceeds the pressure reference value; and A method for compensating a main axis of a compound processing machine, characterized in that it includes a step of performing Z-axis position compensation using a calculated Z-axis position compensation amount when it is determined that the turning center type processing method does not require tool rotation during processing of a workpiece.

11. In paragraph 10, After the step of calculating the above Z-axis position correction amount, In the case where the judgment result is a machining center type machining method that requires tool rotation, a step of comparing the tool diameter displacement to see if the detected tool diameter displacement value exceeds the tool diameter displacement reference value according to additionally stored data; A step of calculating a tool diameter compensation amount using pre-stored data when the tool diameter displacement value detected as a result of tool diameter displacement comparison exceeds the tool diameter displacement reference value; and A method for compensating a spindle of a composite processing machine, characterized in that it includes a step of performing compensation for a dimensional deviation of a spindle using a calculated Z-axis position compensation amount and a calculated tool diameter displacement compensation amount when the machining center type processing method requires rotation of a tool during processing of a workpiece as a result of a judgment.

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